[Bug libc/25920] New: cross-compiling for ARM target fails at linking ld.so.new if THUMB used

["piotr.oniszczuk at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25920

            Bug ID: 25920
           Summary: cross-compiling for ARM target fails at linking
                    ld.so.new if THUMB used
           Product: glibc
           Version: 2.31
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: piotr.oniszczuk at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 12501
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12501&action=edit
glibc config.log from failed arm thumb build

Hi,

I’m trying to build cross-gcc for arm family.
Whole multistep process i'm using of building 9.3gcc cross-gcc works ok for:
i386, x86_64, aarch64 and arm - but fails in arm for thumb case.

gcc9.3.0 cross-compiler I’m using to build glibc is build with multi-lib and
provides following multi-libs:

arm/v5te/softfp;@marm@march=armv5te+fp@mfloat-abi=softfp
arm/v5te/hard;@marm@march=armv5te+fp@mfloat-abi=hard
thumb/nofp;@mthumb@mfloat-abi=soft
thumb/v7/nofp;@mthumb@march=armv7@mfloat-abi=soft
thumb/v7+fp/softfp;@mthumb@march=armv7+fp@mfloat-abi=softfp
thumb/v7+fp/hard;@mthumb@march=armv7+fp@mfloat-abi=hard
thumb/v7-r+fp.sp/softfp;@mthumb@march=armv7-r+fp.sp@mfloat-abi=softfp
thumb/v7-r+fp.sp/hard;@mthumb@march=armv7-r+fp.sp@mfloat-abi=hard
thumb/v7-a/nofp;@mthumb@march=armv7-a@mfloat-abi=soft
thumb/v7-a+fp/softfp;@mthumb@march=armv7-a+fp@mfloat-abi=softfp
thumb/v7-a+fp/hard;@mthumb@march=armv7-a+fp@mfloat-abi=hard
thumb/v7-a+simd/softfp;@mthumb@march=armv7-a+simd@mfloat-abi=softfp
thumb/v7-a+simd/hard;@mthumb@march=armv7-a+simd@mfloat-abi=hard
thumb/v7ve+simd/softfp;@mthumb@march=armv7ve+simd@mfloat-abi=softfp
thumb/v7ve+simd/hard;@mthumb@march=armv7ve+simd@mfloat-abi=hard
thumb/v8-a/nofp;@mthumb@march=armv8-a@mfloat-abi=soft
thumb/v8-a+simd/softfp;@mthumb@march=armv8-a+simd@mfloat-abi=softfp
thumb/v8-a+simd/hard;@mthumb@march=armv8-a+simd@mfloat-abi=hard 

Buildiding glibc 2.31 for ARM works ok for target:

-marm -march=armv5te+fp -mfloat-abi=softfp 

Build fails however (with the same error) for any ARM target with THUMB i.e.:

-mthumb -march=armv7 -mfloat-abi=soft


build error is following:

arm-minimyth-linux-gnueabi-gcc -Wl,--as-needed -pipe -pipe -march=armv7
-mfloat-abi=soft -O2 -fno-lto  -nostdlib -nostartfiles -shared -o
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/ld.so.new
              \
          -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both -Wl,-z,defs
-Wl,-z,now    \
         
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os
-Wl,--version-script=/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/ld.map
               \
          -Wl,-soname=ld-linux.so.3                     \
          -Wl,-defsym=_begin=0
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:
in function `init_tls':
rtld.c:(.text+0x520): undefined reference to `__libc_do_syscall'
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:
in function `dl_main':
rtld.c:(.text+0x2426): undefined reference to `__libc_do_syscall'
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:
in function `_dl_lookup_symbol_x':
(.text+0x798c): undefined reference to `__libc_do_syscall'
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:
in function `_dl_relocate_object':
(.text+0x913e): undefined reference to `__libc_do_syscall'
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:
in function `_dl_fixup':
(.text+0xabac): undefined reference to `__libc_do_syscall'
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/arm-minimyth-linux-gnueabi/9.3.0/../../../../arm-minimyth-linux-gnueabi/bin/ld:
/home/piotro/minimyth-dev/script/devel/glibc/work/main.d/glibc-2.31_build/elf/librtld.os:(.text+0xafc0):
more undefined references to `__libc_do_syscall' follow
collect2: error: ld returned 1 exit status

As whole (exactly the same building procedure with exactly the same sources)
works ok for: i386, x86_64, aarch64 and non-THUMB ARM targets - failed ARM
builds for targets with THUMB I’m considering as bug in glibc.

glibc config.log from failed arm thumb build is attached.

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